99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

<ruby id="n9mgc"><xmp id="n9mgc"></xmp></ruby>

單項選擇題

Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.

A.an auxiliary reservoir
B.a controlling air bottle
C.an emergency air compressor
D.a main air compressor

你可能感興趣的試題

單項選擇題

Two main lubricating oil pumps are usual and are obligatory in （）.

A.container ships
B.bulk carriers
C.passenger ships
D.barges

單項選擇題

In motor-ships, （）, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate.

A.the fuel oil
B.the lubricating oil
C.the refrigerating oil
D.the hydraulic oil